CN115261611A - Production method of magnesium pellet ore - Google Patents
Production method of magnesium pellet ore Download PDFInfo
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- CN115261611A CN115261611A CN202210933650.6A CN202210933650A CN115261611A CN 115261611 A CN115261611 A CN 115261611A CN 202210933650 A CN202210933650 A CN 202210933650A CN 115261611 A CN115261611 A CN 115261611A
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/02—Roasting processes
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/26—Cooling of roasted, sintered, or agglomerated ores
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method for producing magnesium pellets, which belongs to the technical field of magnesium pellets and is characterized by comprising the following steps: s1, red mud iron powder and high-magnesium alkaline iron fine powder are added according to a certain proportion, mixed with various acidic iron fine powders, and then added with bentonite to serve as a mixture; wherein: the plurality of acid iron fine powders comprise 65-grade acid fine powders, 69-grade acid fine powders and Russian fine powders; s2, uniformly mixing the mixture, conveying the mixture into a pelletizing disc in a pelletizing bin, and adding the mixture and water for pelletizing on a disc pelletizer to obtain green pellets, wherein the diameter of each green pellet is 1-20mm; and S3, screening, drying, preheating, roasting and cooling the green pellets in sequence to obtain the low-cost magnesium pellet ore. The invention solves the problems of low metallurgical property and SiO of the pellet 2 High content of MgO, low content of MgO, and the like, and reducesThe cost of the iron-containing material of the pellet ore is reduced, and the economic benefit of pellet production is improved.
Description
Technical Field
The invention belongs to the technical field of magnesium pellets, and particularly relates to a production method of magnesium pellets.
Background
For a long time, blast furnaces adopt a composite furnace charge structure of high-alkalinity sinter ore and acid pellet ore or natural lump ore. MgO required in blast furnace burden is provided by sintering ore, and the high MgO index affects the yield and quality of the sintering ore. Therefore, research on increasing the MgO content in the pellet ore and properly reducing the MgO content in the sintered ore has great significance on smooth production of the blast furnace. Relevant research and production practice at home and abroad shows that: the MgO pellet ore has good metallurgical performance and is an ideal blast furnace burden, the service life of the blast furnace can be prolonged by using the MgO pellet ore, the yield of the blast furnace and the temperature of molten iron can be improved to a certain extent, the fluidity of slag is improved, the coke ratio and the Si content of the molten iron are reduced, and the like.
At present, most pellet production enterprises use a mixture of powdered iron, magnesium oxide powder and bentonite which are directly mixed as a raw material for producing magnesium-containing pellets, and the preparation method is verified to be feasible in laboratory tests, but in the actual production process of the production method, the quality of dry pellets is poor, the surface of kiln head pellets is adhered with powder, the atmosphere in a kiln is poor, the ring formation in the kiln is fast, the cost of iron-containing raw materials is high, and the economic benefit of the pellets is poor.
Disclosure of Invention
Aiming at the technical defects, the invention provides a method for producing magnesium pellets, which utilizes red mud iron powder and high-magnesium alkaline iron fine powder to produce the magnesium pellets, and solves the problems of low metallurgical performance and SiO of the pellets 2 High content, etc., reduces the cost of the iron-containing material of the pellet ore, and improves the economic benefit of pellet production.
In order to achieve the technical purpose, the invention is realized by the following technical scheme:
a method for producing magnesium pellets, comprising:
s1, red mud iron powder and high-magnesium alkaline iron fine powder are added according to a certain proportion, mixed with various acidic iron fine powders, and then added with bentonite to serve as a mixture; wherein:
the plurality of acid iron fine powders comprise 65-grade acid fine powders, 69-grade acid fine powders and Russian fine powders;
s2, uniformly mixing the mixture, conveying the mixture into a pelletizing disc in a pelletizing bin, and adding the mixture and water for pelletizing on a disc pelletizer to obtain green pellets, wherein the diameter of each green pellet is 1-20mm;
and S3, screening, drying, preheating, roasting and cooling the green pellets in sequence to obtain the low-cost magnesium pellet ore.
Preferably: TFe, caO, mgO and SiO in the red mud iron powder 2 、Ti、Al 2 O 3 、S、H 2 The contents of O are as follows in sequence: 46.85%, 0.58%, 0.14%, 3.36%, 2.231%, 12.46%, 0.051%, 9%;
TFe, caO, mgO and SiO in the 62-grade high-magnesium alkaline refined powder 2 、Ti、Al 2 O 3 、S、H 2 The contents of O are as follows in sequence: 62.52%, 0.2%, 6.28%, 3.85%, 0.052%, 0.6%, 0.023%, 10.46%;
TFe, caO, mgO and SiO in the 65-grade acidic fine powder 2 、Ti、Al 2 O 3 、S、H 2 The contents of O are as follows in sequence: 65.46, 0.58%, 0.43%, 6.97%, 0.032%, 0.34%, 0.222%, 9.2%;
TFe, caO, mgO and SiO in the 69-grade acid fine powder 2 、Ti、Al 2 O 3 、S、H 2 The contents of O are as follows in sequence: 69%, 0.21%, 0.29%, 2.26%, 0.222%, 0.63%, 0.1%, 10.47%;
TFe, caO, mgO and SiO in the Russian fine powder 2 、Ti、Al 2 O 3 、S、H 2 The contents of O are as follows in sequence: 64.09%, 0.29%, 0.49%, 7.54%, 0.021%, 0.61%, 0.264%, 5.85%;
preferably: bentonite, 65-grade acid fine powder, 69-grade acid fine powder, russian fine powder, 62-grade high-magnesium alkaline fine powder and red mud iron powder are mixed according to the mass percentage: 1.6 percent, 47.8 percent, 13.6 percent, 25 percent, 10 percent and 2 percent.
Preferably: in S1: mixing 2 parts by weight of red mud iron powder, 10 parts by weight of 62-grade high magnesium alkaline fine powder, 25 parts by weight of Russian fine powder, 13.6 parts by weight of 69-grade acid fine powder, 47.8 parts by weight of 65-grade acid fine powder and 1.6 parts by weight of bentonite to obtain a mixture.
Preferably: the screening process in S3 includes: the big ball roller screen screens the green balls with the size fraction larger than 16mm, and pelletizing again; the green pellets with the size fraction smaller than 8mm are sieved by a small pellet roller sieve and are re-pelletized; obtaining qualified green balls with rice grain grade of 8-16mm, and then drying the green balls in a chain grate.
Preferably: the drying process comprises the following steps: the temperature is gradually increased from 200 ℃ to 400 ℃, the temperature increasing rate is 24-26 ℃/min, and the total drying time is 7.7-8.3min.
Preferably: the preheating process comprises the following steps: preheating for 55-65s when the temperature is 500 ℃, preheating for 55-65s when the temperature is 600 ℃, preheating for 55-65s when the temperature is 700 ℃, preheating for 55-65s when the temperature is 800 ℃, preheating for 55-65s when the temperature is 900 ℃, preheating for 110-130s when the temperature is 1000 ℃, and preheating for 160-200s when the temperature is 1080 ℃; the highest point temperature of the air box reaches 480-510 ℃.
Preferably: the roasting process comprises the following steps: the temperature of the rotary kiln is controlled to 1150-1250 ℃, and the roasting time is 25-35 min.
Preferably: the cooling process comprises the following steps: cooling with three blowers on the circular cooler gradually for 11-13min at 950-1100 deg.C, 7-9min at 700-800 deg.C, 11-13min at 350-450 deg.C, and naturally cooling for 11-13min below 150 deg.C.
The invention has the advantages and the technical effects that:
after various iron-containing fine powder materials are mixed, the compatibility of the iron-containing materials is improved, green pellet roasting is facilitated, the conditions of more powder, poor atmosphere and poor cooling in the roasting process are effectively improved, the mass production target can be achieved in the production process of the pellet of the grate-rotary kiln, the yield is not affected, the production process is easy to control, the ring forming condition of the rotary kiln is delayed, the production of the high-magnesium pellet is normalized, and the quality index reaches the index requirement of a steel mill.
Drawings
Fig. 1 is a flow chart provided by an embodiment of the present application.
Detailed Description
In order to make the above objects, control systems and advantages of the present invention more apparent, the present invention will be described in further detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, a method for producing magnesium pellets includes the following steps: mixing red mud iron powder and high-magnesium basic iron fine powder according to a certain proportion, mixing with various acidic iron fine powders, and then mixing with bentonite as a mixture; uniformly mixing the mixture by using a mixer, conveying the mixture into a pelletizing disc in a pelletizing bin by using a belt, and adding the mixture and water for pelletizing on a disc pelletizer to obtain green pellets; and screening, drying, preheating, roasting and cooling the green pellets to obtain the magnesium pellets.
The method comprises the following specific steps:
the main quality indexes of the used iron-containing raw materials are as follows:
TABLE 1 main quality index of iron-containing raw material
Mixing the materials according to the following ore blending scheme:
TABLE 2 blending scheme
The materials are mixed according to the proportion in the table to form a mixed material.
Mixing the mixed materials uniformly by a mixer, carrying out treatment by a wet grinding machine, conveying the mixed materials into a pelletizing disc in a pelletizing bin through a belt, and adding the mixed materials and water for pelletizing on a disc pelletizer to obtain green pellets, wherein the diameter of each green pellet is 1-20mm.
The test of producing high magnesium pellets by adding high magnesium alkaline refined powder on site, the green pellets in the production stable period are selected to be compared with the conventional pellet test, and the comparison result is shown in the following table 3.
TABLE 3 comparison of relative index of the green pellets
Screening the green pellets, wherein the process comprises the following steps: the big ball roller screen screens the green balls with the size fraction larger than 16mm away for re-pelletizing; the pellet roller screen is used for screening green pellets with the size fraction smaller than 8mm for re-pelletizing; obtaining qualified green balls with rice grain grade of 8-16mm, and then drying the green balls in a chain grate machine.
The green ball drying process comprises the following steps: the temperature is gradually increased from 200 ℃ to 400 ℃, the heating rate is 24-26 ℃/min, and the total drying time is 7.7-8.3min.
Preheating after drying the green pellets, wherein the preheating process comprises the following steps: preheating for 55-65s at 500 ℃, 55-65s at 600 ℃, 55-65s at 700 ℃, 55-65s at 800 ℃, 55-65s at 900 ℃, 110-130s at 1000 ℃ and 160-200s at 1080 ℃; the highest point temperature of the air box reaches 480-510 ℃.
The preheated pellets enter a rotary kiln for roasting, and the roasting process of the pellets is as follows: the kiln temperature is controlled to 1150-1250 ℃, and the roasting time is 25-35 min.
The pellet production process comprises five stages of drying 1, drying 2, preheating, roasting and cooling. The thermal operating schedule of the high magnesium pellet test and the conventional pellet test is shown in the following table.
Table 4 shows the comparison of main parameters of thermal operation
Therefore, under the condition of equal machine speed, the temperature of a hood of each section of the chain grate and the temperature in the rotary kiln during the production of the high-magnesium pellets are not much different from the conventional pellets. The thermal regulation is relatively stable, and the atmosphere of the rotary kiln is good.
After roasting is finished, the roasted material enters a circular cooler for cooling, and the cooling process comprises the following steps: cooling with three blowers on the ring cooling machine gradually, cooling at 950-1100 deg.C for 11-13min, cooling to 700-800 deg.C for 7-9min, cooling to 350-450 deg.C for 11-13min, and naturally cooling to 150 deg.C or below for 11-13min.
After cooling, the high-magnesium pellet ore is obtained, and the quality indexes are as follows.
Table 5 shows the chemical composition (%) and strength index of the low-cost magnesium pellets
The high-magnesium pellets produced by adding the high-magnesium alkaline fine powder and the red mud iron powder have good chemical components, low content of harmful impurities, good metallurgical performance and strength index slightly superior to that of the conventional pellets.
After various iron-containing fine powder materials are mixed, the compatibility of the iron-containing materials is improved, green pellet roasting is facilitated, the conditions of more powder, poor atmosphere and poor cooling in the roasting process are effectively improved, the mass production target can be achieved in the production process of the pellet of the grate-rotary kiln, the yield is not affected, the production process is easy to control, the ring forming condition of the rotary kiln is delayed, the production of the high-magnesium pellet is normalized, and the quality index reaches the index requirement of a steel mill.
And after cooling, obtaining the low-cost magnesium pellet, wherein the finished magnesium pellet has good chemical components, the content of magnesium oxide is 1-1.2%, the content of harmful impurities is low, and the metallurgical performance is good.
Because the ore blending scheme uses red mud iron powder and high-magnesium alkaline fine powder with lower cost, the cost of the iron-containing materials is 20-25 yuan per ton lower than that of the conventional pellets, the production cost of the pellets can be greatly reduced, and the economy is improved.
The invention uses two iron-containing raw materials with higher cost performance, namely the red mud iron powder and the high-magnesium alkaline iron fine powder, so the iron-containing pellet material cost is effectively reduced. The two materials are added together with two acid iron fine powders and one Russian fine powder, so that the compatibility of each material is improved, the roasting of green pellets is facilitated, the conditions of more powder, poor atmosphere and poor cooling in the roasting process are effectively improved, the yield is not influenced, the production process is easy to control, the ring formation condition of a rotary kiln is delayed, and the production of magnesium pellets is normalized. On the premise of ensuring the quality index of the pellets, the iron-containing material cost of the pellets is effectively reduced, and the economic benefit of pellet production is improved.
The present invention is not limited to the above preferred embodiments, and any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. A method for producing a magnesium pellet, comprising:
s1, red mud iron powder and high-magnesium alkaline iron fine powder are added according to a certain proportion, mixed with various acidic iron fine powders, and then added with bentonite to serve as a mixture; wherein:
the plurality of acid iron fine powders comprise 65-grade acid fine powders, 69-grade acid fine powders and Russian fine powders;
s2, uniformly mixing the mixture, conveying the mixture into a pelletizing disc in a pelletizing bin, and adding the mixture and water for pelletizing on a disc pelletizer to obtain green pellets, wherein the diameter of each green pellet is 1-20mm;
and S3, sequentially screening, drying, preheating, roasting and cooling the green pellets to obtain the low-cost magnesium pellet ore.
2. The method for producing magnesium pellets according to claim 1, characterized in that: TFe, caO, mgO and SiO in the red mud iron powder 2 、Ti、Al 2 O 3 And S, H O content is as follows: 46.85%, 0.58%, 0.14%, 3.36%, 2.231%, 12.46%, 0.051％、9％；
TFe, caO, mgO and SiO in the 62-grade high-magnesium alkali powder 2 、Ti、Al 2 O 3 、S、H 2 The contents of O are as follows in sequence: 62.52%, 0.2%, 6.28%, 3.85%, 0.052%, 0.6%, 0.023%, 10.46%;
TFe, caO, mgO and SiO in the 65-grade acid fine powder 2 、Ti、Al 2 O 3 、S、H 2 The contents of O are as follows in sequence: 65.46, 0.58%, 0.43%, 6.97%, 0.032%, 0.34%, 0.222%, 9.2%;
TFe, caO, mgO and SiO in the 69-grade acid fine powder 2 、Ti、Al 2 O 3 、S、H 2 The contents of O are as follows in sequence: 69%, 0.21%, 0.29%, 2.26%, 0.222%, 0.63%, 0.1%, 10.47%;
TFe, caO, mgO and SiO in the Russian fine powder 2 、Ti、Al 2 O 3 、S、H 2 The contents of O are as follows in sequence: 64.09%, 0.29%, 0.49%, 7.54%, 0.021%, 0.61%, 0.264%, 5.85%.
3. The method for producing magnesium pellets according to claim 2, characterized in that: mixing the bentonite, 65-grade acid fine powder, 69-grade acid powder, russia fine powder, 62-grade high-magnesium alkaline fine powder and red mud iron powder according to the mass percentage: 1.6 percent, 47.8 percent, 13.6 percent, 25 percent, 10 percent and 2 percent.
4. The method for producing magnesium pellets according to claim 1, characterized in that: in S1: mixing 2 parts by weight of red mud iron powder, 10 parts by weight of 62-grade high magnesium alkaline fine powder, 25 parts by weight of Russian fine powder, 13.6 parts by weight of 69-grade acid fine powder, 47.8 parts by weight of 65-grade acid fine powder and 1.6 parts by weight of bentonite to obtain a mixture.
5. The method for producing magnesium pellets according to claim 1, characterized in that: the screening process in S3 includes: the big ball roller screen screens the green balls with the size fraction larger than 16mm away, and pelletizing again; the pellet roller screen is used for screening green pellets with the size fraction smaller than 8mm for re-pelletizing; obtaining qualified green balls with rice grain grade of 8-16mm, and then drying the green balls in a chain grate machine.
6. The method for producing magnesium pellets according to claim 1, wherein: the drying process comprises: the temperature is gradually increased from 200 ℃ to 400 ℃, the heating rate is 24-26 ℃/min, and the total drying time is 7.7-8.3min.
7. The method for producing magnesium pellets according to claim 1, wherein: the preheating process comprises the following steps: preheating for 55-65s at 500 ℃, 55-65s at 600 ℃, 55-65s at 700 ℃, 55-65s at 800 ℃, 55-65s at 900 ℃, 110-130s at 1000 ℃ and 160-200s at 1080 ℃; the highest point temperature of the air box reaches 480-510 ℃.
8. The method for producing magnesium pellets according to claim 1, characterized in that: the roasting process comprises the following steps: the temperature of the rotary kiln is controlled to 1150-1250 ℃ and the roasting time is 25-35 min.
9. The method for producing magnesium pellets according to claim 1, wherein: the cooling process comprises the following steps: cooling with three blowers on the ring cooling machine gradually, cooling at 950-1100 deg.C for 11-13min, cooling to 700-800 deg.C for 7-9min, cooling to 350-450 deg.C for 11-13min, and naturally cooling to 150 deg.C or below for 11-13min.
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4326887A (en) * | 1979-11-05 | 1982-04-27 | Dofasco Inc. | Basic process of producing basic fluxed pellets for iron-making |
| CN101153350A (en) * | 2007-09-17 | 2008-04-02 | 济南钢铁股份有限公司 | Technique for industrialized development and utilization of red mud |
| CN102839249A (en) * | 2012-08-03 | 2012-12-26 | 莱芜钢铁集团有限公司 | Method for producing iron fine powder by directly reducing high-iron red mud with rotary hearth furnace |
| CN112442565A (en) * | 2020-11-24 | 2021-03-05 | 东北大学 | High-iron red mud reduction iron extraction process |
-
2022
- 2022-08-04 CN CN202210933650.6A patent/CN115261611B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4326887A (en) * | 1979-11-05 | 1982-04-27 | Dofasco Inc. | Basic process of producing basic fluxed pellets for iron-making |
| CN101153350A (en) * | 2007-09-17 | 2008-04-02 | 济南钢铁股份有限公司 | Technique for industrialized development and utilization of red mud |
| CN102839249A (en) * | 2012-08-03 | 2012-12-26 | 莱芜钢铁集团有限公司 | Method for producing iron fine powder by directly reducing high-iron red mud with rotary hearth furnace |
| CN112442565A (en) * | 2020-11-24 | 2021-03-05 | 东北大学 | High-iron red mud reduction iron extraction process |
Non-Patent Citations (2)
| Title |
|---|
| 贺建峰;刘国防;: "济钢生产镁质球团矿的试验研究与实践" * |
| 赵玉潮;卜敏;曾香梅;莫朝文;徐毅;宁振;: "球团配加铝厂赤泥铁粉的试验研究" * |
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